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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: SocketAcceptor.html 740 2013-10-02 21:27:31Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.net;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.IOException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.net.InetAddress;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.net.ServerSocket;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.net.Socket;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.HashSet;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.dellroad.stuff.spring.AbstractBean;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>/**<a name="line.18"></a>
<span class="sourceLineNo">019</span> * Spring bean that listens for connections on a TCP socket and spawns a child thread to handle each new connection.<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Subclasses must implement {@link #getSocketHandler}. Only the {@link #getPort port} property is required to be set.<a name="line.20"></a>
<span class="sourceLineNo">021</span> */<a name="line.21"></a>
<span class="sourceLineNo">022</span>public abstract class SocketAcceptor extends AbstractBean {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    /**<a name="line.24"></a>
<span class="sourceLineNo">025</span>     * Default maximum incoming connection queue length ({@value}).<a name="line.25"></a>
<span class="sourceLineNo">026</span>     *<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * @see #setBacklog<a name="line.27"></a>
<span class="sourceLineNo">028</span>     */<a name="line.28"></a>
<span class="sourceLineNo">029</span>    public static final int DEFAULT_BACKLOG = 50;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>    private static final long NOTIFICATION_INTERVAL = 5 * 1000 * 1000 * 1000L;      // 5 seconds<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    private final HashSet&lt;SocketInfo&gt; connections = new HashSet&lt;SocketInfo&gt;();<a name="line.33"></a>
<span class="sourceLineNo">034</span>    private InetAddress address;<a name="line.34"></a>
<span class="sourceLineNo">035</span>    private int backlog = DEFAULT_BACKLOG;<a name="line.35"></a>
<span class="sourceLineNo">036</span>    private int port;<a name="line.36"></a>
<span class="sourceLineNo">037</span>    private int maxConnections;<a name="line.37"></a>
<span class="sourceLineNo">038</span>    private ServerSocket serverSocket;<a name="line.38"></a>
<span class="sourceLineNo">039</span>    private Thread serverThread;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private boolean started;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    /**<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * Verifies configuration and invokes {@link #start}.<a name="line.43"></a>
<span class="sourceLineNo">044</span>     */<a name="line.44"></a>
<span class="sourceLineNo">045</span>    @Override<a name="line.45"></a>
<span class="sourceLineNo">046</span>    public void afterPropertiesSet() throws Exception {<a name="line.46"></a>
<span class="sourceLineNo">047</span>        super.afterPropertiesSet();<a name="line.47"></a>
<span class="sourceLineNo">048</span>        if (this.port == 0)<a name="line.48"></a>
<span class="sourceLineNo">049</span>            throw new IllegalArgumentException("TCP port not set");<a name="line.49"></a>
<span class="sourceLineNo">050</span>        if (this.port &lt; 1 || this.port &gt; 65535)<a name="line.50"></a>
<span class="sourceLineNo">051</span>            throw new IllegalArgumentException("invalid TCP port " + this.port);<a name="line.51"></a>
<span class="sourceLineNo">052</span>        if (this.maxConnections &lt; 0)<a name="line.52"></a>
<span class="sourceLineNo">053</span>            throw new IllegalArgumentException("invalid maxConnections " + this.maxConnections);<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this.start();<a name="line.54"></a>
<span class="sourceLineNo">055</span>    }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    /**<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * Invokes {@link #stop}.<a name="line.58"></a>
<span class="sourceLineNo">059</span>     */<a name="line.59"></a>
<span class="sourceLineNo">060</span>    @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public void destroy() throws Exception {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        this.stop();<a name="line.62"></a>
<span class="sourceLineNo">063</span>        super.destroy();<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * Get address to listen on.<a name="line.67"></a>
<span class="sourceLineNo">068</span>     *<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * @return address to listen on, or null for any<a name="line.69"></a>
<span class="sourceLineNo">070</span>     */<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public InetAddress getInetAddress() {<a name="line.71"></a>
<span class="sourceLineNo">072</span>        return this.address;<a name="line.72"></a>
<span class="sourceLineNo">073</span>    }<a name="line.73"></a>
<span class="sourceLineNo">074</span>    public void setInetAddress(InetAddress address) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>        this.address = address;<a name="line.75"></a>
<span class="sourceLineNo">076</span>    }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    /**<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * Get maximum connect backlog.<a name="line.79"></a>
<span class="sourceLineNo">080</span>     */<a name="line.80"></a>
<span class="sourceLineNo">081</span>    public int getBacklog() {<a name="line.81"></a>
<span class="sourceLineNo">082</span>        return this.backlog;<a name="line.82"></a>
<span class="sourceLineNo">083</span>    }<a name="line.83"></a>
<span class="sourceLineNo">084</span>    public void setBacklog(int backlog) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        this.backlog = backlog;<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span>    /**<a name="line.88"></a>
<span class="sourceLineNo">089</span>     * Get maximum number of concurrent connections.<a name="line.89"></a>
<span class="sourceLineNo">090</span>     *<a name="line.90"></a>
<span class="sourceLineNo">091</span>     * @return max conncurrent connections, or zero for unlimited<a name="line.91"></a>
<span class="sourceLineNo">092</span>     */<a name="line.92"></a>
<span class="sourceLineNo">093</span>    public int getMaxConnections() {<a name="line.93"></a>
<span class="sourceLineNo">094</span>        return this.maxConnections;<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span>    public void setMaxConnections(int maxConnections) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        this.maxConnections = maxConnections;<a name="line.97"></a>
<span class="sourceLineNo">098</span>    }<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span>    /**<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * Get TCP port to listen on.<a name="line.101"></a>
<span class="sourceLineNo">102</span>     */<a name="line.102"></a>
<span class="sourceLineNo">103</span>    public int getPort() {<a name="line.103"></a>
<span class="sourceLineNo">104</span>        return this.port;<a name="line.104"></a>
<span class="sourceLineNo">105</span>    }<a name="line.105"></a>
<span class="sourceLineNo">106</span>    public void setPort(int port) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>        this.port = port;<a name="line.107"></a>
<span class="sourceLineNo">108</span>    }<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>    /**<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * Start accepting incoming connections. Does nothing if already started.<a name="line.111"></a>
<span class="sourceLineNo">112</span>     */<a name="line.112"></a>
<span class="sourceLineNo">113</span>    public void start() throws IOException {<a name="line.113"></a>
<span class="sourceLineNo">114</span>        synchronized (this) {<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>            // Already started?<a name="line.116"></a>
<span class="sourceLineNo">117</span>            if (this.started)<a name="line.117"></a>
<span class="sourceLineNo">118</span>                return;<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>            // Create server thread<a name="line.120"></a>
<span class="sourceLineNo">121</span>            String addr = this.address != null ? "" + this.address : "*";<a name="line.121"></a>
<span class="sourceLineNo">122</span>            String threadName = this.getClass().getSimpleName() + "[" + addr + ":" + this.port + "]";<a name="line.122"></a>
<span class="sourceLineNo">123</span>            this.serverThread = new Thread(threadName) {<a name="line.123"></a>
<span class="sourceLineNo">124</span>                @Override<a name="line.124"></a>
<span class="sourceLineNo">125</span>                public void run() {<a name="line.125"></a>
<span class="sourceLineNo">126</span>                    SocketAcceptor.this.run();<a name="line.126"></a>
<span class="sourceLineNo">127</span>                }<a name="line.127"></a>
<span class="sourceLineNo">128</span>            };<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span>            // Create socket<a name="line.130"></a>
<span class="sourceLineNo">131</span>            this.serverSocket = this.createServerSocket();<a name="line.131"></a>
<span class="sourceLineNo">132</span>            if (this.serverSocket == null)<a name="line.132"></a>
<span class="sourceLineNo">133</span>                throw new IOException("createServerSocket() returned a null socket");<a name="line.133"></a>
<span class="sourceLineNo">134</span>        }<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>        // Start server thread<a name="line.136"></a>
<span class="sourceLineNo">137</span>        this.serverThread.start();<a name="line.137"></a>
<span class="sourceLineNo">138</span>        this.started = true;<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>    private void run() {<a name="line.141"></a>
<span class="sourceLineNo">142</span>        try {<a name="line.142"></a>
<span class="sourceLineNo">143</span>            while (true) {<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>                // Block while we've reached our connection limit<a name="line.145"></a>
<span class="sourceLineNo">146</span>                synchronized (this) {<a name="line.146"></a>
<span class="sourceLineNo">147</span>                    boolean logged = false;<a name="line.147"></a>
<span class="sourceLineNo">148</span>                    while (this.serverSocket != null &amp;&amp; this.maxConnections &gt; 0 &amp;&amp; this.connections.size() &gt;= this.maxConnections) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>                        if (!logged) {<a name="line.149"></a>
<span class="sourceLineNo">150</span>                            this.log.warn(Thread.currentThread().getName() + " has reached connection limit of "<a name="line.150"></a>
<span class="sourceLineNo">151</span>                              + this.maxConnections + ", temporarily refusing new connections");<a name="line.151"></a>
<span class="sourceLineNo">152</span>                            logged = true;<a name="line.152"></a>
<span class="sourceLineNo">153</span>                        }<a name="line.153"></a>
<span class="sourceLineNo">154</span>                        try {<a name="line.154"></a>
<span class="sourceLineNo">155</span>                            this.wait();<a name="line.155"></a>
<span class="sourceLineNo">156</span>                        } catch (InterruptedException e) {<a name="line.156"></a>
<span class="sourceLineNo">157</span>                            Thread.currentThread().interrupt();<a name="line.157"></a>
<span class="sourceLineNo">158</span>                        }<a name="line.158"></a>
<span class="sourceLineNo">159</span>                    }<a name="line.159"></a>
<span class="sourceLineNo">160</span>                    if (logged)<a name="line.160"></a>
<span class="sourceLineNo">161</span>                        this.log.info(Thread.currentThread().getName() + " is accepting new connections again");<a name="line.161"></a>
<span class="sourceLineNo">162</span>                }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>                // Have we been stopped?<a name="line.164"></a>
<span class="sourceLineNo">165</span>                ServerSocket serverSocketCopy;<a name="line.165"></a>
<span class="sourceLineNo">166</span>                synchronized (this) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>                    serverSocketCopy = this.serverSocket;<a name="line.167"></a>
<span class="sourceLineNo">168</span>                }<a name="line.168"></a>
<span class="sourceLineNo">169</span>                if (serverSocketCopy == null)<a name="line.169"></a>
<span class="sourceLineNo">170</span>                    break;<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span>                // Accept a new connection<a name="line.172"></a>
<span class="sourceLineNo">173</span>                final Socket socket = serverSocketCopy.accept();<a name="line.173"></a>
<span class="sourceLineNo">174</span>                final String socketDesc = socket.getInetAddress().getHostAddress() + ":" + socket.getPort();<a name="line.174"></a>
<span class="sourceLineNo">175</span>                this.log.info("accepted new TCP connection from " + socketDesc);<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span>                // Get a handler for it<a name="line.177"></a>
<span class="sourceLineNo">178</span>                final SocketHandler handler = this.getSocketHandler(socket);<a name="line.178"></a>
<span class="sourceLineNo">179</span>                if (handler == null) {<a name="line.179"></a>
<span class="sourceLineNo">180</span>                    this.log.info("null handler returned by getSocketHandler, closing connection from " + socketDesc);<a name="line.180"></a>
<span class="sourceLineNo">181</span>                    try {<a name="line.181"></a>
<span class="sourceLineNo">182</span>                        socket.close();<a name="line.182"></a>
<span class="sourceLineNo">183</span>                    } catch (IOException e) {<a name="line.183"></a>
<span class="sourceLineNo">184</span>                        // ignore<a name="line.184"></a>
<span class="sourceLineNo">185</span>                    }<a name="line.185"></a>
<span class="sourceLineNo">186</span>                    continue;<a name="line.186"></a>
<span class="sourceLineNo">187</span>                }<a name="line.187"></a>
<span class="sourceLineNo">188</span>                final SocketInfo socketInfo = new SocketInfo(socket, handler);<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span>                // Create a thread that will handle the connection.<a name="line.190"></a>
<span class="sourceLineNo">191</span>                Thread handlerThread = new Thread() {<a name="line.191"></a>
<span class="sourceLineNo">192</span>                    public void run() {<a name="line.192"></a>
<span class="sourceLineNo">193</span>                        try {<a name="line.193"></a>
<span class="sourceLineNo">194</span>                            handler.handleConnection(socket);<a name="line.194"></a>
<span class="sourceLineNo">195</span>                        } catch (Throwable t) {<a name="line.195"></a>
<span class="sourceLineNo">196</span>                            SocketAcceptor.this.log.error("error handling connection in " + Thread.currentThread().getName(), t);<a name="line.196"></a>
<span class="sourceLineNo">197</span>                        } finally {<a name="line.197"></a>
<span class="sourceLineNo">198</span>                            synchronized (SocketAcceptor.this) {<a name="line.198"></a>
<span class="sourceLineNo">199</span>                                SocketAcceptor.this.connections.remove(socketInfo);<a name="line.199"></a>
<span class="sourceLineNo">200</span>                                SocketAcceptor.this.notifyAll();<a name="line.200"></a>
<span class="sourceLineNo">201</span>                            }<a name="line.201"></a>
<span class="sourceLineNo">202</span>                            try {<a name="line.202"></a>
<span class="sourceLineNo">203</span>                                socket.close();<a name="line.203"></a>
<span class="sourceLineNo">204</span>                            } catch (IOException e) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>                                // ignore<a name="line.205"></a>
<span class="sourceLineNo">206</span>                            }<a name="line.206"></a>
<span class="sourceLineNo">207</span>                        }<a name="line.207"></a>
<span class="sourceLineNo">208</span>                    }<a name="line.208"></a>
<span class="sourceLineNo">209</span>                };<a name="line.209"></a>
<span class="sourceLineNo">210</span>                handlerThread.setName(handler.getClass().getSimpleName() + "[" + socketDesc + "]");<a name="line.210"></a>
<span class="sourceLineNo">211</span>                socketInfo.setThread(handlerThread);<a name="line.211"></a>
<span class="sourceLineNo">212</span><a name="line.212"></a>
<span class="sourceLineNo">213</span>                // Start handler thread and update active connections<a name="line.213"></a>
<span class="sourceLineNo">214</span>                synchronized (SocketAcceptor.this) {<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span>                    // Need to check again for stopped-ness because we released the lock<a name="line.216"></a>
<span class="sourceLineNo">217</span>                    if (this.serverSocket == null) {<a name="line.217"></a>
<span class="sourceLineNo">218</span>                        this.log.info("discarding connection from " + socketDesc + " due to shutdown");<a name="line.218"></a>
<span class="sourceLineNo">219</span>                        try {<a name="line.219"></a>
<span class="sourceLineNo">220</span>                            socket.close();<a name="line.220"></a>
<span class="sourceLineNo">221</span>                        } catch (IOException e) {<a name="line.221"></a>
<span class="sourceLineNo">222</span>                            // ignore<a name="line.222"></a>
<span class="sourceLineNo">223</span>                        }<a name="line.223"></a>
<span class="sourceLineNo">224</span>                        break;<a name="line.224"></a>
<span class="sourceLineNo">225</span>                    }<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span>                    // Start handler<a name="line.227"></a>
<span class="sourceLineNo">228</span>                    handlerThread.start();<a name="line.228"></a>
<span class="sourceLineNo">229</span>                    this.connections.add(socketInfo);<a name="line.229"></a>
<span class="sourceLineNo">230</span>                }<a name="line.230"></a>
<span class="sourceLineNo">231</span>            }<a name="line.231"></a>
<span class="sourceLineNo">232</span>        } catch (IOException e) {<a name="line.232"></a>
<span class="sourceLineNo">233</span>            boolean expected;<a name="line.233"></a>
<span class="sourceLineNo">234</span>            synchronized (this) {<a name="line.234"></a>
<span class="sourceLineNo">235</span>                expected = this.serverSocket == null;<a name="line.235"></a>
<span class="sourceLineNo">236</span>            }<a name="line.236"></a>
<span class="sourceLineNo">237</span>            if (!expected)<a name="line.237"></a>
<span class="sourceLineNo">238</span>                this.log.error("exception in acceptor thread " + Thread.currentThread().getName(), e);<a name="line.238"></a>
<span class="sourceLineNo">239</span>        } catch (Throwable t) {<a name="line.239"></a>
<span class="sourceLineNo">240</span>            this.log.error("exception in acceptor thread " + Thread.currentThread().getName(), t);<a name="line.240"></a>
<span class="sourceLineNo">241</span>        } finally {<a name="line.241"></a>
<span class="sourceLineNo">242</span>            this.log.info("acceptor thread " + Thread.currentThread().getName() + " exiting");<a name="line.242"></a>
<span class="sourceLineNo">243</span>            this.closeServerSocket();<a name="line.243"></a>
<span class="sourceLineNo">244</span>            synchronized (this) {<a name="line.244"></a>
<span class="sourceLineNo">245</span>                this.serverThread = null;<a name="line.245"></a>
<span class="sourceLineNo">246</span>                this.notifyAll();<a name="line.246"></a>
<span class="sourceLineNo">247</span>            }<a name="line.247"></a>
<span class="sourceLineNo">248</span>        }<a name="line.248"></a>
<span class="sourceLineNo">249</span>    }<a name="line.249"></a>
<span class="sourceLineNo">250</span><a name="line.250"></a>
<span class="sourceLineNo">251</span>    /**<a name="line.251"></a>
<span class="sourceLineNo">252</span>     * Stop accepting connections. Does nothing if already stopped.<a name="line.252"></a>
<span class="sourceLineNo">253</span>     *<a name="line.253"></a>
<span class="sourceLineNo">254</span>     * &lt;p&gt;<a name="line.254"></a>
<span class="sourceLineNo">255</span>     * Any currently active connections are stopped via {@link SocketHandler#stop SocketHandler.stop()},<a name="line.255"></a>
<span class="sourceLineNo">256</span>     * and this method waits until all such connections have returned from {@link SocketHandler#handleConnection<a name="line.256"></a>
<span class="sourceLineNo">257</span>     * SocketHandler.handleConnection()} before returning.<a name="line.257"></a>
<span class="sourceLineNo">258</span>     */<a name="line.258"></a>
<span class="sourceLineNo">259</span>    public synchronized void stop() {<a name="line.259"></a>
<span class="sourceLineNo">260</span><a name="line.260"></a>
<span class="sourceLineNo">261</span>        // Already shut down?<a name="line.261"></a>
<span class="sourceLineNo">262</span>        if (!this.started)<a name="line.262"></a>
<span class="sourceLineNo">263</span>            return;<a name="line.263"></a>
<span class="sourceLineNo">264</span><a name="line.264"></a>
<span class="sourceLineNo">265</span>        // Stop acceptor thread<a name="line.265"></a>
<span class="sourceLineNo">266</span>        if (this.serverThread != null)<a name="line.266"></a>
<span class="sourceLineNo">267</span>            this.log.info("stopping acceptor thread");<a name="line.267"></a>
<span class="sourceLineNo">268</span>        this.closeServerSocket();<a name="line.268"></a>
<span class="sourceLineNo">269</span>        while (this.serverThread != null) {<a name="line.269"></a>
<span class="sourceLineNo">270</span>            try {<a name="line.270"></a>
<span class="sourceLineNo">271</span>                this.wait();<a name="line.271"></a>
<span class="sourceLineNo">272</span>            } catch (InterruptedException e) {<a name="line.272"></a>
<span class="sourceLineNo">273</span>                Thread.currentThread().interrupt();<a name="line.273"></a>
<span class="sourceLineNo">274</span>            }<a name="line.274"></a>
<span class="sourceLineNo">275</span>        }<a name="line.275"></a>
<span class="sourceLineNo">276</span><a name="line.276"></a>
<span class="sourceLineNo">277</span>        // Notify all active connections<a name="line.277"></a>
<span class="sourceLineNo">278</span>        for (SocketInfo socketInfo : this.connections) {<a name="line.278"></a>
<span class="sourceLineNo">279</span><a name="line.279"></a>
<span class="sourceLineNo">280</span>            // Notify handler<a name="line.280"></a>
<span class="sourceLineNo">281</span>            try {<a name="line.281"></a>
<span class="sourceLineNo">282</span>                socketInfo.getHandler().stop(socketInfo.getThread(), socketInfo.getSocket());<a name="line.282"></a>
<span class="sourceLineNo">283</span>            } catch (Throwable t) {<a name="line.283"></a>
<span class="sourceLineNo">284</span>                this.log.error("error stopping " + socketInfo.getHandler(), t);<a name="line.284"></a>
<span class="sourceLineNo">285</span>            }<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>            // Close socket<a name="line.287"></a>
<span class="sourceLineNo">288</span>            try {<a name="line.288"></a>
<span class="sourceLineNo">289</span>                socketInfo.getSocket().close();<a name="line.289"></a>
<span class="sourceLineNo">290</span>            } catch (IOException e) {<a name="line.290"></a>
<span class="sourceLineNo">291</span>                // ignore<a name="line.291"></a>
<span class="sourceLineNo">292</span>            }<a name="line.292"></a>
<span class="sourceLineNo">293</span>        }<a name="line.293"></a>
<span class="sourceLineNo">294</span><a name="line.294"></a>
<span class="sourceLineNo">295</span>        // Wait for all active connections to complete<a name="line.295"></a>
<span class="sourceLineNo">296</span>        long lastTime = System.nanoTime();<a name="line.296"></a>
<span class="sourceLineNo">297</span>        boolean logged = false;<a name="line.297"></a>
<span class="sourceLineNo">298</span>        while (!this.connections.isEmpty()) {<a name="line.298"></a>
<span class="sourceLineNo">299</span>            long nextTime = System.nanoTime();<a name="line.299"></a>
<span class="sourceLineNo">300</span>            if (!logged || nextTime - lastTime &gt; NOTIFICATION_INTERVAL) {<a name="line.300"></a>
<span class="sourceLineNo">301</span>                this.log.info("waiting for " + this.connections.size() + " active connection(s) to stop...");<a name="line.301"></a>
<span class="sourceLineNo">302</span>                logged = true;<a name="line.302"></a>
<span class="sourceLineNo">303</span>            }<a name="line.303"></a>
<span class="sourceLineNo">304</span>            try {<a name="line.304"></a>
<span class="sourceLineNo">305</span>                this.wait();<a name="line.305"></a>
<span class="sourceLineNo">306</span>            } catch (InterruptedException e) {<a name="line.306"></a>
<span class="sourceLineNo">307</span>                Thread.currentThread().interrupt();<a name="line.307"></a>
<span class="sourceLineNo">308</span>            }<a name="line.308"></a>
<span class="sourceLineNo">309</span>        }<a name="line.309"></a>
<span class="sourceLineNo">310</span>        if (logged)<a name="line.310"></a>
<span class="sourceLineNo">311</span>            this.log.info("all active connection(s) have stopped");<a name="line.311"></a>
<span class="sourceLineNo">312</span><a name="line.312"></a>
<span class="sourceLineNo">313</span>        // Done<a name="line.313"></a>
<span class="sourceLineNo">314</span>        this.started = false;<a name="line.314"></a>
<span class="sourceLineNo">315</span>    }<a name="line.315"></a>
<span class="sourceLineNo">316</span><a name="line.316"></a>
<span class="sourceLineNo">317</span>    /**<a name="line.317"></a>
<span class="sourceLineNo">318</span>     * Shut down socket.<a name="line.318"></a>
<span class="sourceLineNo">319</span>     *<a name="line.319"></a>
<span class="sourceLineNo">320</span>     * @return true if socket was shut down by this invocation, false if it was already shut down<a name="line.320"></a>
<span class="sourceLineNo">321</span>     */<a name="line.321"></a>
<span class="sourceLineNo">322</span>    private synchronized void closeServerSocket() {<a name="line.322"></a>
<span class="sourceLineNo">323</span>        if (this.serverSocket == null)<a name="line.323"></a>
<span class="sourceLineNo">324</span>            return;<a name="line.324"></a>
<span class="sourceLineNo">325</span>        try {<a name="line.325"></a>
<span class="sourceLineNo">326</span>            this.serverSocket.close();<a name="line.326"></a>
<span class="sourceLineNo">327</span>        } catch (IOException e) {<a name="line.327"></a>
<span class="sourceLineNo">328</span>            // ignore<a name="line.328"></a>
<span class="sourceLineNo">329</span>        } finally {<a name="line.329"></a>
<span class="sourceLineNo">330</span>            this.serverSocket = null;<a name="line.330"></a>
<span class="sourceLineNo">331</span>        }<a name="line.331"></a>
<span class="sourceLineNo">332</span>    }<a name="line.332"></a>
<span class="sourceLineNo">333</span><a name="line.333"></a>
<span class="sourceLineNo">334</span>    /**<a name="line.334"></a>
<span class="sourceLineNo">335</span>     * Create the server's socket via which connections will be accepted.<a name="line.335"></a>
<span class="sourceLineNo">336</span>     *<a name="line.336"></a>
<span class="sourceLineNo">337</span>     * &lt;p&gt;<a name="line.337"></a>
<span class="sourceLineNo">338</span>     * The implementation in {@link SocketAcceptor} creates the socket and sets the "reuse address" flag.<a name="line.338"></a>
<span class="sourceLineNo">339</span>     * Subclasses may override.<a name="line.339"></a>
<span class="sourceLineNo">340</span>     */<a name="line.340"></a>
<span class="sourceLineNo">341</span>    protected ServerSocket createServerSocket() throws IOException {<a name="line.341"></a>
<span class="sourceLineNo">342</span>        ServerSocket socket = new ServerSocket(this.port, this.backlog, this.address);<a name="line.342"></a>
<span class="sourceLineNo">343</span>        socket.setReuseAddress(true);<a name="line.343"></a>
<span class="sourceLineNo">344</span>        return socket;<a name="line.344"></a>
<span class="sourceLineNo">345</span>    }<a name="line.345"></a>
<span class="sourceLineNo">346</span><a name="line.346"></a>
<span class="sourceLineNo">347</span>    /**<a name="line.347"></a>
<span class="sourceLineNo">348</span>     * Get the {@link SocketHandler} that will handle a new connection using the given socket.<a name="line.348"></a>
<span class="sourceLineNo">349</span>     *<a name="line.349"></a>
<span class="sourceLineNo">350</span>     * @return new handler, or &lt;code&gt;null&lt;/code&gt; to disconnect the socket immediately<a name="line.350"></a>
<span class="sourceLineNo">351</span>     */<a name="line.351"></a>
<span class="sourceLineNo">352</span>    protected abstract SocketHandler getSocketHandler(Socket socket) throws IOException;<a name="line.352"></a>
<span class="sourceLineNo">353</span><a name="line.353"></a>
<span class="sourceLineNo">354</span>    // Information about one active connection<a name="line.354"></a>
<span class="sourceLineNo">355</span>    private static class SocketInfo {<a name="line.355"></a>
<span class="sourceLineNo">356</span><a name="line.356"></a>
<span class="sourceLineNo">357</span>        private final Socket socket;<a name="line.357"></a>
<span class="sourceLineNo">358</span>        private final SocketHandler handler;<a name="line.358"></a>
<span class="sourceLineNo">359</span>        private Thread thread;<a name="line.359"></a>
<span class="sourceLineNo">360</span><a name="line.360"></a>
<span class="sourceLineNo">361</span>        SocketInfo(Socket socket, SocketHandler handler) {<a name="line.361"></a>
<span class="sourceLineNo">362</span>            this.socket = socket;<a name="line.362"></a>
<span class="sourceLineNo">363</span>            this.handler = handler;<a name="line.363"></a>
<span class="sourceLineNo">364</span>        }<a name="line.364"></a>
<span class="sourceLineNo">365</span><a name="line.365"></a>
<span class="sourceLineNo">366</span>        public Socket getSocket() {<a name="line.366"></a>
<span class="sourceLineNo">367</span>            return this.socket;<a name="line.367"></a>
<span class="sourceLineNo">368</span>        }<a name="line.368"></a>
<span class="sourceLineNo">369</span><a name="line.369"></a>
<span class="sourceLineNo">370</span>        public SocketHandler getHandler() {<a name="line.370"></a>
<span class="sourceLineNo">371</span>            return this.handler;<a name="line.371"></a>
<span class="sourceLineNo">372</span>        }<a name="line.372"></a>
<span class="sourceLineNo">373</span><a name="line.373"></a>
<span class="sourceLineNo">374</span>        public Thread getThread() {<a name="line.374"></a>
<span class="sourceLineNo">375</span>            return this.thread;<a name="line.375"></a>
<span class="sourceLineNo">376</span>        }<a name="line.376"></a>
<span class="sourceLineNo">377</span>        public void setThread(Thread thread) {<a name="line.377"></a>
<span class="sourceLineNo">378</span>            this.thread = thread;<a name="line.378"></a>
<span class="sourceLineNo">379</span>        }<a name="line.379"></a>
<span class="sourceLineNo">380</span>    }<a name="line.380"></a>
<span class="sourceLineNo">381</span>}<a name="line.381"></a>
<span class="sourceLineNo">382</span><a name="line.382"></a>




























































</pre>
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